public static IEnumerable <(GraphNode node, int distance)> FindPaths(GraphNode startGraphNode)
{
var queue = new System.Collections.Generic.Queue <GraphNode>();
var visited = new HashSet <GraphNode>();
var result = new List <(GraphNode, int)>();
queue.Enqueue(startGraphNode);
var distance = 1;
while (queue.Count != 0)
{
var nodes = queue.ToList();
queue.Clear();
foreach (var node in nodes)
{
visited.Add(node);
foreach (var incidentNode in node.Edges.Where(x => !visited.Contains(x)))
{
queue.Enqueue(incidentNode);
result.Add((incidentNode, distance));
}
}
distance++;
}
return(result);
}